Genes can be silenced through epigenetic changes that occur Genes can be silenced through epigenetic changes that occur at CpG islands located in RNA. at the C-terminus of histone tails. at lysines located in the nucleic acids sequence. at regulatory regions in DNA.
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Genes can be silenced through epigenetic changes that occur
Genes can be silenced through epigenetic changes that occur
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- Which of the following is a method through which cells can control their gene expression? Increase a gene's stability using post-translational modifications Epigenetic modifications of the DNA or histones to regulate DNA avilability phosphorylation of thymidines formation of crosslinks between the DNA strands and the histonesWhich of the following are examples of molecular changes thatcan have an epigenetic effect on gene expression?a. Chromatin remodelingb. Covalent histone modificationc. Localization of histone variantsd. DNA methylatione. Feedback loopsf. All of the aboveEpigenetic changes in gene regulation are caused by _ _ _ _ _ _ _ a. missing nucleotides or chromosomes b. modifications to histones and the DNA, but not the nucleotide sequence itself c. mutations of the nucleotide sequence
- Epigenetic changes in gene regulation are caused by ________. missing nucleotides or chromosomes missing nucleotides or chromosomes mutations of the nucleotide sequence mutations of the nucleotide sequence modifications to histones and the DNA, but not the nucleotide sequence itselfWhich of the following is not an example of epigenetic gene regulation?a. genomic imprinting in mammalsb. X-chromosome inactivation in mammalsc. cell differentiation in animals and plantsd. regulation of the lac operon in E. coli via allolactosee. the effects of toxins in cigarette smoke that alter gene expressionWhich of the following is not a possible outcome of changing the epigenetic code? a) exposure of regulatory region b) binding of transcription factors c) altered gene expression d) repositioning of nucleosomes by polymerases
- Control of gene expression in eukaryotic cells occurs at which level(s)? a. only the transcriptional level b. epigenetic and transcriptional levels c. epigenetic, transcriptional, and translational levels d. epigenetic, transcriptional, post-transcriptional, translational, and post-translational levelsPost-translational control refers to: a. regulation of gene expression after transcription b. regulation of gene expression after translation c. control of epigenetic activation d. period between transcription and translationBinding of _______ to _______ in DNA can increase the rate of transcription of specific genes. a. activators; repressors c. repressors; operators b. activators; enhancers d. repressors; enhancers
- Which of the following is NOT a mechanism of control of gene expression Group of answer choices a. Co-dominance b. mRNA transport c. DNA Methylation d. Control of translation e. Control of transcriptionEpigenetic marks regulate gene expression. Which epigenetic mark is NOT associated with positive gene expression? Histone acetylation Histone Methylation De-methylated DNA Methylated DNAWhich of the following statament is NOT TRUE about gene expression?a. The expression of genes that code for proteins includes two stages: replication and translationb. Translation is the synthesis of a polypeptide using the information in the mRNA.c. During gene expression, the information encoded in genes is used to make specific polypeptide chains or RNA molecules.d. Gene expression is the process by which DNA directs the synthesis of proteins
